I have always dreamed of having service like what you refer to on gear at all levels and you sound like that kind of dealer. I have a friend who is a dealer and he will bend over backwards for people and he has one of the best ears of anyone I have met but he doesn't have the technical experteise you seem to show. You seem to be the best of both worlds. Since I buy used or get special deals it is rare that I would buy new but I would keep you on my short list for product that my buddy doesn't carry. Like I plan to by a Rel sub within the next year and expect to buy new since used doesn't save enough to justify. My friend can't/doesn't carry it so if you did I would consider this purchase with you.
Anyway, I think someone looking for speakers at that level and size would do well to listen to your advice. Don't ignore the room but make allowance and take it into consideration as needed. If anyone has ever seen the Sound Labs or a Grande Utopia they wouldn't be asking for an in home demo, that is not reasonable unless the dealer has a strong committement to purchase but even then, I have to imagine with the right preperation, planning, a person can find out everything they need to at the dealer/show or at other peoples homes which the dealer may recommend.
Thanks again for the service focus and the practical advice.
cd